*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
ul{
	list-style: none;
}
a{
	text-decoration: none;
}
.content{
	width: 1200px;
	margin: 20px auto;
	border: 1px solid black;
	padding: 3px;
}
.fl{
	float: left;
}
.fr{
	float: right;
}
.of{
	overflow: auto;
}
.ct{
	text-align: center;
}
.red{
	color: red;
}
.logo{
	width: 300px;
	margin-left: 20px;
}
.user{
	width: 500px;
	margin-top: 10px;
}
.side{
	width: 220px;
	margin: 50px 5px;
	min-height: 400px;
}
.side ul li a{
	display: block;
	padding: 10px 5px;
	margin: 15px 0;
	border: 1px solid green;
	text-align: center;
	color: green;
}
.side ul li a:hover{
	background: #efefef;
}
.main{
	width: 960px;
	padding: 15px 30px;
	min-height: 500px;
	border: 1px solid black;
}
form div.group{
	width: 500px;
	margin: 20px auto;
}